Month	Millions Of Man-Hours
1921-07-01	74.2000
1921-08-01	84.1000
1921-09-01	81.5000
1921-10-01	85.5000
1921-11-01	74.0000
1921-12-01	63.7000
1922-01-01	57.7000
1922-02-01	52.9000
1922-03-01	62.8000
1922-04-01	66.0000
1922-05-01	77.3000
1922-06-01	82.0000
1922-07-01	80.5000
1922-08-01	91.8000
1922-09-01	86.5000
1922-10-01	87.1000
1922-11-01	76.9000
1922-12-01	67.0000
1923-01-01	68.8000
1923-02-01	60.8000
1923-03-01	74.1000
1923-04-01	78.7000
1923-05-01	91.1000
1923-06-01	96.7000
1923-07-01	97.5000
1923-08-01	105.100
1923-09-01	91.5000
1923-10-01	97.8000
1923-11-01	81.0000
1923-12-01	68.6000
1924-01-01	68.5000
1924-02-01	64.3000
1924-03-01	71.3000
1924-04-01	80.8000
1924-05-01	86.6000
1924-06-01	83.8000
1924-07-01	87.5000
1924-08-01	89.0000
1924-09-01	85.2000
1924-10-01	90.4000
1924-11-01	74.7000
1924-12-01	68.1000
1925-01-01	69.2000
1925-02-01	61.7000
1925-03-01	70.4000
1925-04-01	78.0000
1925-05-01	83.3000
1925-06-01	88.9000
1925-07-01	91.0000
1925-08-01	91.3000
1925-09-01	87.1000
1925-10-01	91.1000
1925-11-01	76.9000
1925-12-01	72.9000
1926-01-01	69.0000
1926-02-01	66.4000
1926-03-01	77.0000
1926-04-01	83.6000
1926-05-01	90.1000
1926-06-01	96.8000
1926-07-01	99.6000
1926-08-01	99.7000
1926-09-01	93.9000
1926-10-01	96.1000
1926-11-01	85.2000
1926-12-01	77.6000
1927-01-01	71.3000
1927-02-01	65.7000
1927-03-01	78.7000
1927-04-01	87.6000
1927-05-01	94.7000
1927-06-01	101.700
1927-07-01	98.9000
1927-08-01	102.100
1927-09-01	91.6000
1927-10-01	92.5000
1927-11-01	80.9000
1927-12-01	71.9000
1928-01-01	67.0000
1928-02-01	62.5000
1928-03-01	73.2000
1928-04-01	78.0000
1928-05-01	91.5000
1928-06-01	95.1000
1928-07-01	92.5000
1928-08-01	98.2000
1928-09-01	86.3000
1928-10-01	92.6000
1928-11-01	77.5000
1928-12-01	67.6000
1929-01-01	68.7000
1929-02-01	60.7000
1929-03-01	73.1000
1929-04-01	83.3000
1929-05-01	93.0000
1929-06-01	94.6000
1929-07-01	100.000
1929-08-01	103.900
1929-09-01	91.1000
1929-10-01	96.9000
1929-11-01	78.5000
1929-12-01	69.2000
1930-01-01	66.5000
1930-02-01	58.9000
1930-03-01	69.0000
1930-04-01	77.4000
1930-05-01	83.3000
1930-06-01	78.4000
1930-07-01	77.1000
1930-08-01	75.2000
1930-09-01	67.9000
1930-10-01	68.0000
1930-11-01	52.7000
1930-12-01	51.1000
1931-01-01	50.6000
1931-02-01	44.4000
1931-03-01	51.6000
1931-04-01	55.9000
1931-05-01	58.1000
1931-06-01	59.6000
1931-07-01	58.0000
1931-08-01	55.3000
1931-09-01	50.6000
1931-10-01	48.6000
1931-11-01	38.1000
1931-12-01	36.1000
1932-01-01	34.5000
1932-02-01	33.8000
1932-03-01	38.1000
1932-04-01	38.1000
1932-05-01	40.6000
1932-06-01	40.1000
1932-07-01	36.4000
1932-08-01	36.9000
1932-09-01	34.9000
1932-10-01	36.1000
1932-11-01	32.3000
1932-12-01	30.1000
1933-01-01	28.3000
1933-02-01	26.3000
1933-03-01	28.7000
1933-04-01	29.4000
1933-05-01	33.8000
1933-06-01	35.4000
1933-07-01	36.5000
1933-08-01	40.8000
1933-09-01	39.3000
1933-10-01	39.6000
1933-11-01	33.3000
1933-12-01	30.7000
1934-01-01	31.5000
1934-02-01	30.1000
1934-03-01	34.3000
1934-04-01	35.5000
1934-05-01	42.1000
1934-06-01	44.2000
1934-07-01	43.1000
1934-08-01	44.2000
1934-09-01	38.7000
1934-10-01	41.9000
1934-11-01	33.9000
1934-12-01	31.2000
1935-01-01	34.7000
1935-02-01	29.6000
1935-03-01	33.1000
1935-04-01	35.1000
1935-05-01	39.7000
1935-06-01	41.7000
1935-07-01	44.4000
1935-08-01	44.6000
1935-09-01	39.4000
1935-10-01	42.2000
1935-11-01	34.7000
1935-12-01	32.9000
1936-01-01	35.6000
1936-02-01	38.6000
1936-03-01	40.0000
1936-04-01	43.7000
1936-05-01	44.7000
1936-06-01	47.6000
1936-07-01	48.6000
1936-08-01	47.9000
1936-09-01	47.0000
1936-10-01	48.5000
1936-11-01	39.5000
1936-12-01	38.3000
1937-01-01	37.1000
1937-02-01	37.3000
1937-03-01	42.2000
1937-04-01	45.8000
1937-05-01	49.5000
1937-06-01	54.1000
1937-07-01	54.3000
1937-08-01	53.0000
1937-09-01	47.6000
1937-10-01	45.3000
1937-11-01	37.4000
1937-12-01	34.2000
1938-01-01	31.8000
1938-02-01	28.8000
1938-03-01	33.7000
1938-04-01	32.7000
1938-05-01	34.0000
1938-06-01	37.2000
1938-07-01	37.1000
1938-08-01	41.3000
1938-09-01	40.3000
1938-10-01	41.6000
1938-11-01	36.3000
1938-12-01	33.0000
1939-01-01	31.8000
1939-02-01	29.8000
1939-03-01	35.2000
1939-04-01	35.2000
1939-05-01	41.2000
1939-06-01	44.0000
1939-07-01	42.6000
1939-08-01	45.8000
1939-09-01	42.2000
1939-10-01	43.8000
1939-11-01	38.1000
1939-12-01	33.5000
1940-01-01	34.1000
1940-02-01	32.0000
1940-03-01	34.5000
1940-04-01	37.4000
1940-05-01	42.2000
1940-06-01	43.3000
1940-07-01	46.5000
1940-08-01	48.3000
1940-09-01	43.7000
1940-10-01	47.1000
1940-11-01	38.5000
1940-12-01	34.6000
1941-01-01	36.2000
1941-02-01	32.6000
1941-03-01	38.0000
1941-04-01	43.3000
1941-05-01	49.2000
1941-06-01	51.2000
1941-07-01	55.1000
1941-08-01	56.7000
1941-09-01	54.4000
1941-10-01	56.9000
1941-11-01	47.1000
1941-12-01	45.1000
1942-01-01	42.3000
1942-02-01	38.0000
1942-03-01	45.3000
1942-04-01	54.5000
1942-05-01	55.2000
1942-06-01	60.8000
1942-07-01	64.1000
1942-08-01	64.9000
1942-09-01	60.6000
1942-10-01	63.2000
1942-11-01	55.3000